How to tick off Gray

Buy him clothes with fake buttons and zippers that don't unbutton or unzip. Wait till he wears them. Nudge Natsu, Erza, Lucy, and Happy when he tries to take them off. Proceed to say "Oh, he's losing his touch." Very disappointedly, and "Having a little trouble?".

Catcall and wolf Gray when he strips.

Take a picture of Natsu and Lucy together after Natsu catches her when she falls off the bridge. Make many copies. Put them all over Gray's room.

Photoshop Gray's head over Natsu's so Gray is being squashed by Lucy. Put these pictures in Juvia's room.

Yell Exhibitionist every time you see Gray enter a room.

Secretly find out Gray's cell phone number without telling him your number. Then take pictures of Gray stripping. Send Gray these picks, telling him "Stop stripping yourself. Stop stripping yourself."

Get Juvia and Gray together and ask Gray why he hasn't done anything about Juvia's confession. Hand the mic to the reporter.

Play "Ice ice baby" whenever Gray uses ice mage magic. Then wink at him when he gives you a strang look.

Stare at Gray so closely you can count his eyebrow hairs. When he looks at you like you're crazy just shake your head at him, and sadly walk away.

Ask Gray: "Ur. What is that? What even is that? Did your teacher's parents hate her? What's wrong with your strip teach whose name is monosyllabic?"

Kiss Gray (If your name is Prolific chick) and then run away. Scream his name will doing it. Do it five more times.

Hide in a bush near Fairy Tail. When Gray even comes into close proximity and yell "YARG!". Nobody will know the difference but Juvia.

Make Gray hug random trees. Talk in a therapeutic voice while he hugs them: "Now. Didn't that make you feel better?"

Tie Juvia up with black straps around her shoulders, which tie at the back and end in a leash. When you cross paths with Gray yell, "RUN GRAY RUN! RUN GRAY!" Watch him run. Release the Juvia.

Imitate Gray's expression right beside him. Steal his punch lines right in front of him.

Look at Gray after he's used ice mage magic and say, "It's over 9000!"